Non-Hermitian topological matter has attracted great attention in
the past decade (see [1]}, [2]}, [3]}, [4]}, [5]}, [6]}
for reviews). Theoretically, these unique phases have been classified
according to their symmetries and exceptional topologies [7]}, [8]}, [9]}, [10]}, [11]}, [12]}.
Experimentally, non-Hermitian topological phases have been engineered
in a broad range of physical platforms [13]}, [14]}, [15]}, [16]}, [17]}, [18]}, [19]}, [20]}, [21]}, [22]}, [23]}, [24]}, [25]}, [26]},
yielding potential applications such as topological lasers [27]}, [28]}, [29]}
and high-performance sensors [30]}, [31]}, [32]}, [33]}.
